Build efficient and reliable backend applications in WebAssembly.
What is it?
Ice is a container for backend applications in WebAssembly.
WebAssembly, which is mainly used to build client-side Web applications, can also be used to build server-side applications. With a managed execution environment and the underlying JIT (wasm-core) based on LLVM, Ice is able to achieve a higher level of security (and additional safety for C/C++ applications), provide platform-independent high-level abstractions, and bring a few special features like dynamic inter-machine application migration and more accurate service monitoring.
Latest nightly Rust and LLVM 6 are required.
cargo build --release
First, create a root directory to place configurations & applications:
mkdir my_ice_root cd my_ice_root
Then, create a config file
config.yaml in the root directory, whose format is defined in
applications: - name: hello_world path: ./apps/hello_world
Here we've specified an application named
hello_world located at
./apps/hello_world, and the application will be automatically initialized when
ice_core is launched.
Now let's initialize the
mkdir apps cd apps cargo new hello_world cd hello_world
[lib] section and the runtime library
ia to the newly-created
 = "hello_world" = ["cdylib"]  = "0.1"
And create another
config.yaml in the
hello_world directory, which is the application-level metadata definition (defined in
package_name: com.example.hello_world bin: target/wasm32-unknown-unknown/release/hello_world.wasm
Write some code to print "Hello, world!" in
extern crate ia; app_init!;
cargo build --release --target wasm32-unknown-unknown
cd back to my_ice_root and launch
ice_core, and you should see your first
hello_world application running!
Comparison with native binaries
The WebAssembly VM has to do some necessary checks and translations to ensure things work correctly. Therefore, it is always a little slower than precompiled native binaries. However, the difference is quite small and normally doesn't become the performance bottleneck for real-world applications.
In addition, Ice Core is able to provide a few features that a native environment doesn't provide:
- Accurate permission control
- Run-time inter-machine application migration (in progress)
- Service monitoring and management (in progress)